Fix automatic network selection mode issue

Currently, if user selects "Choose automatically"
in Settings > More > Cellular networks > Network operators,
dialog is shown infinitely, and user can not cancel with back key.
Because COMPLETE message is not sent in case of already automatic mode.
To fix it, change to send COMPLETE message even if already automatic mode.

Bug: 24270612
Change-Id: Id312ac846c95a32337aebbd815de03416f2b614f